3Com VCX v7111 Installation Manual page 35

VCX V7111 H.323 Quick Setup Screen
Figure 18
To configure basic H.323 parameters, follow these steps:
If the VCX V7111 is behind a router with NAT enabled, perform the following procedure.
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If it isn't, leave the 'NAT IP Address' field undefined.
Determine the "public" IP address assigned to the router (by using, for instance,
router Web management). Enter this public IP address in the 'NAT IP Address' field.
Enable the DMZ configuration on the residential router for the LAN port where the
VCX V7111 gateway is connected. This enables unknown packets to be routed to
the DMZ port.
When working with a Gatekeeper, set 'Working with Gatekeeper' field, under 'H.323
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Parameters', to 'Yes' and enter the IP address of the primary Gatekeeper in the field
'Gatekeeper IP Address'. When no Gatekeeper is used, the internal routing table is used
to route the calls.
Leave parameter 'Enable Annex D/T.38 FAX Relay' at its default unless your technical
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requirements differ.
Select the coder (i.e., vocoder) that best suits your VoIP system requirements. The
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default coder is: G.7231 30 msec. To program the entire list of coders you want the VCX
V7111 to use, click the button on the left side of the '1
nd th
for the 2 to 5 coders appear. Select coders according to your system requirements.
Note that coders higher on the list are preferred and take precedence over coders lower
on the list.
3Com VCX V7111 Fast Track Installation Guide
st
Coder' field; the drop-down list
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